This paper presents a method for determining the network lines and buses where the occurrence of faults will lead to voltage sags causing severe financial losses in the power system. The proposed method is based on a typical stochastic assessment of voltage sags. The network regions where fault occurrences will simultaneously lead to voltage sags at different sensitive load points can be determ...

This paper presents several design issues related to the monolithic integration of a 3-phase AC to DC low voltage, low power rectifier for 3-phase micro source electrical conditioning. Reduced input voltage operation (down to 1V), high efficiency, and output voltage regulations are implemented, based on commercially available CMOS technology. Global design and system issues are detailed. The ma...

Fakultetsopponent: Biträdande professor Simon Matti, institutionen för ekonomi, teknik och samhälle, avdelningen för samhällsvetenskap vid Luleå tekniska universitet.

High-voltage direct current (HVDC) is a commonly used technology for long-distance power transmission, due to its low resistive losses and low costs. In this paper, a novel distributed controller for multi-terminal HVDC (MTDC) systems is proposed. Under certain conditions on the controller gains, it is shown to stabilize the MTDC system. The controller is shown to always keep the voltages close...

CFE-1 is a unique plasmid-encoded AmpC β-lactamase with the regulator gene ampR. It imparts high resistance to most cephalosporins with constitutive high-level β-lactamase activity. Here, the β-lactamase activities and expression levels of ampC with or without ampR were investigated. Results suggested that the resistance of CFE-1 to cephalosporins is caused by a substitution in AmpR, in which t...

The focus of this paper is towards identification of an appropriate Modelling Method for the Value Reference Model. In order to address such challenge, paper first outlines a brief use case description to identify the object under observation and to define the actual purpose of modelling. Second, an application of the Generic Modelling Method Specification framework is outlined and applied for ...

Frameshift mutations in a restricted portion of the arabinose operon regulatory gene araC from Escherichia coli give rise to active AraC protein, likely from the in vivo synthesis of two incomplete fragments that are active together. Synthesis of corresponding fragments, each separately inactive, from two plasmids within cells also resulted in complementation.

This paper studies the discrete-time sampled-data approximation of the input-constrained finite-horizon linear quadratic regulator problem. Explicit estimates for the error in the performance index rendered by the solution of a discrete-time approximation are provided. This result can be used to evaluate the level of sub-optimality of the sampled-data solution corresponding to a given discretis...